# The Experimental tab

These preferences enable features that are considered experimental, inserted to garner user feedback.

- Graphics acceleration: One Logisim user observed that adding `-Dsun.java2d.d3d=True` to the command line seemed to improve Logisim's graphics performance by telling it to use hardware graphics acceleration. This drop-down box attempts to configure Logisim to set this up; reports about whether this drop-down box has any effect on performance would be welcome. It won't have any effect until Logisim is restarted.
- Simulation Event Queue: The Simulation Event Queue is a priority queue of events to be processed by the simulator. The choice of queue implementation has an impact on the efficiency, and speed, of the simulation. The most efficient for one project may not be the most efficient for another. We are currently providing 5 choices. We ask for feedback about which works better for you. You can make comments in the Simulation Queue discussion at https://github.com/logisim-evolution/logisim-evolution/discussions. A change won't have any effect until the project is closed and opened again. The choices are:
  - Java Priority Queue: This is currently the default. A solid choice that deals reasonably with extreme situations, but not especially fast.
  - Splay Tree Priority Queue: This can be faster, but for some projects it may have an unbalanced tree and since it is recursive it may even fail on a stack overflow.
  - Linked Priority Queue: A linked queue that searches from the back for insertion. Fast for some projects, but it has poor worst case performance.
  - Sorted Linked List of Queues: Can be quite fast. This implementation uses a sorted list of time nodes, each of which has a standard linked queue to hold all events targeting that time.
  - Sorted Tree of Queues: Can also be quite fast. It uses a Sorted Tree for the time nodes. It works better than the Linked List of Queues on projects with a large number of different delays. However, it has more overhead on simpler projects. Even very large projects may be slower than with the Linked List of Queues.

Next: Command line options.